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Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/21976
Title: Measurement of D-0-(D)over-bar(0) mixing using the ratio of lifetimes for the decays D-0 -> K-pi(+) and K+K-
Authors: Babar Collaboration; Azzolini, Virginia; López-March, Neus; Martínez-Vidal, Fernando; Milanés, Diego A.; Oyanguren, Arantza; Aubert, B.
Issue Date: 29-Oct-2009
Publisher: American Physical Society
Citation: Physical Review - Section D - Particles and Fields 80 (7): 071103 (2009)
Abstract: We measure the rate of D-0-(D) over bar0 mixing with the observable y(CP) = (tau(K pi)/tau(KK)) - 1, where tau(KK) and tau(K pi) are, respectively, the mean lifetimes of CP-even D-0 -> K+K- and CP-mixed D-0 -> K-pi(+) decays, using a data sample of 384 fb(-1) collected by the BABAR detector at the SLAC PEP-II asymmetric-energy B Factory. From a sample of D-0 and (D) over bar0 decays where the initial flavor of the decaying meson is not determined, we obtain y(CP) = [1.12 +/- 0.26(stat) +/- 0.22(syst)]%, which excludes the no-mixing hypothesis at 3.3 sigma, including both statistical and systematic uncertainties. This result is in good agreement with a previous BABAR measurement of y(CP) obtained from a sample of D*(+) -> D-0 pi(+) events, where the D-0 rho decays to K-pi(+), K+K-, and pi(+)pi(-), which is disjoint with the untagged D-0 events used here. Combining the two results taking into account statistical and systematic uncertainties, where the systematic uncertainties are assumed to be 100% correlated, we find y(CP) = [1.16 +/- 0.22(stat) +/- 0.18(syst)]%, which excludes the no-mixing hypothesis at 4.1 sigma.
Publisher version (URL): http://dx.doi.org/ 10.1103/PhysRevD.80.071103
URI: http://hdl.handle.net/10261/21976
ISSN: 1550-7998
DOI: 10.1103/PhysRevD.80.071103
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